CN107064595B - The crystal current sensor being vortexed based on complex light - Google Patents
The crystal current sensor being vortexed based on complex light Download PDFInfo
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- CN107064595B CN107064595B CN201710377187.0A CN201710377187A CN107064595B CN 107064595 B CN107064595 B CN 107064595B CN 201710377187 A CN201710377187 A CN 201710377187A CN 107064595 B CN107064595 B CN 107064595B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
- G01R15/245—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect
- G01R15/246—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect based on the Faraday, i.e. linear magneto-optic, effect
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
Abstract
The invention discloses a kind of crystal current sensors being vortexed based on complex light, its laser emission element exports linear polarization fundamental-mode gaussian beam, the fundamental-mode gaussian beam of linear polarization is divided into two-way by composite light beam generation unit, and by two-way light modulation at light vortex beams, beam is closed again and is converted to the complex light vortex beams of circular polarization state, complex light vortex beams are passed through in crystal by crystal sensing unit along the optical axis of crystal, and applies electric current and generate along the magnetic field in optical axis of crystal direction, detection unit detection applies the light distribution of the complex light vortex beams before and after magnetic field, complex light vortex beams deflect, and corresponding added size of current is calculated by deflection size, to realize the function of current sense.The present invention is vortexed in transmission process using light and keeps circular polarization state characteristic, the principle for causing the change of light polarization that can directly embody in compound hot spot using Faraday magnetooptical effect, effectively solves the problems, such as to make optical fiber current mutual inductor sensitivity decrease because of linear birefrigence.
Description
Technical field
The present invention relates to a kind of crystal current sensors, spread more particularly to a kind of crystal current of Sagnac interferometer type
Sensor, applied to magnetic-field measurement and the technical field of current sense.
Background technique
Currently, the principle of most optical current mutual inductors is all based on Faraday magnetooptical effect, during functionization
Encounter conflict: the Verdet constant of one side silica fibre is lower, need to increase twining for fiber optic loop to improve sensitivity
Around the number of turns；On the other hand, the introducing linear birefrigence that the increase of optical fiber the number of turns can be additional, the linear birefrigence of introducing make optical fiber
The sensitivity decrease of current transformer, excessive linear birefrigence even can inhibit Faraday effect.
Light vortex beams can have unlimited number of eigenstate, and between eigenstate be it is mutually orthogonal, this is equivalent to
It is following one of the most potential communication mode that may be used for we provide a new communication dimensions.Additionally, it is contemplated that
The linear birefrigence problem and light vortex beams encountered to current all-fiber current sensor is in high sensitivity sensing and height
How potential using value in precision measurement, research realize high sensitivity, the high precision to electric current using light vortex beams
The detection of degree has great research significance with sensing, becomes technical problem urgently to be resolved.
Summary of the invention
In order to solve prior art problem, it is an object of the present invention to overcome the deficiencies of the prior art, and to provide one kind
Based on the crystal current sensor that complex light is vortexed, be it is a kind of completely new, be different from conventional current detection mode based on compound
The crystal current sensing device that light is vortexed.The present invention makes full use of light vortex that can keep good circular polarization in transmission process
The characteristic of state, the principle for causing the change of light polarization that can directly embody in compound hot spot using Faraday magnetooptical effect,
Effectively the sensitivity decrease for making optical fiber current mutual inductor because of linear birefrigence is solved the problems, such as, to realize the function of current sense
Energy.
Purpose is created to reach foregoing invention, the present invention adopts the following technical solutions:
It is a kind of based on complex light be vortexed crystal current sensor, including laser emission element, front end non-polarizing beamsplitter,
The output end of composite light beam generation unit, crystal sensing unit and detection unit, laser emission element connects unpolarized point of front end
The input terminal of beam device, the input terminal and output end of composite light beam generation unit all connect the signal end of front end non-polarizing beamsplitter,
The input terminal of the output end connection crystal sensing unit of front end non-polarizing beamsplitter, the output end connecting detection of crystal sensing unit
The input terminal of unit；Laser emission element is used to export the fundamental-mode gaussian beam of linear polarization, the line of laser emission element output
The wavelength of the fundamental-mode gaussian beam of polarization state is in the modulated optical wavelength range of composite light beam generation unit；Unpolarized point of front end
Beam device passes through the fundamental-mode gaussian beam of linear polarization directly, to the basic mode Gauss of composite light beam generation unit input linear polarization
Light beam；
Composite light beam generation unit is used to the fundamental-mode gaussian beam of the linear polarization received being converted into light vortex beams,
The fundamental-mode gaussian beam of the linear polarization received is first converted into the basic mode Gauss light of circular polarization state by composite light beam generation unit
Beam, then the fundamental-mode gaussian beam of circular polarization state is divided into two-way linearly polarized light, two-way linearly polarized light is then modulated into light whirlpool
Optically-active beam, then close beam and be converted to the complex light vortex beams of circular polarization state, it then exports to front end non-polarizing beamsplitter；
Front end non-polarizing beamsplitter can also reflex to the complex light vortex beams generated from composite light beam generation unit
Crystal sensing unit；Crystal sensing unit mainly includes crystal, and crystal sensing unit will be for that will come from composite light beam generation unit
The complex light vortex beams of generation are passed through in crystal, and are applied along the magnetic field in optical axis of crystal direction, make to generate method after applying magnetic field
Magneto-optic effect is drawn, the complex light vortex beams before and after application magnetic field are then reflexed into detection unit；Detection unit is for visiting
The light distribution for applying the complex light vortex beams before and after magnetic field from crystal sensing unit is surveyed, and calculates and adds magnetic field front and back light
The deflection angle of spot, then using the host computer of the data processing module of detection unit and detection unit external connection, by hot spot
The size of deflection calculates, the size of corresponding added electric current, to realize the sensing detection to electric current.
Laser emission element mainly includes the polarization-maintaining broadband tunable laser of coaxial setting as a preferred technical solution,
Device, single mode polarization-maintaining wire jumper and optical fiber collimator, and each optical device of laser emission element is all total with front end non-polarizing beamsplitter
Axis setting, input terminal of the optical fiber collimator output end as the output end connection front end non-polarizing beamsplitter of laser emission element；
Polarization-maintaining broadband tunable laser device is used to generate the basic mode Gauss light of linear polarization；It is adjustable that single mode polarization-maintaining wire jumper connects polarization-maintaining broadband
Humorous laser for exporting laser, and keeps the polarization state of light constant；Optical fiber collimator is for being collimated and being expanded light beam
Beam, the laser for launching optical fiber collimator output end form the fundamental-mode gaussian beam of a branch of parallel linear polarization.
The light beam of the output end output of laser emission element is in horizontality, complex light as a preferred technical solution,
The fundamental-mode gaussian beam of the linear polarization received can be converted into the fundamental-mode gaussian beam of circular polarization state and equal by beam generation unit
It is divided into two-way, is all the way a branch of horizontal linear polarization light, another way is a branch of perpendicular linear polarization light, and two-way linearly polarized light is modulated
At light vortex beams, then closes beam and be converted to the complex light vortex beams of circular polarization state.As further preferred technical solution,
Composite light beam generation unit mainly includes a quarter slide, polarization beam apparatus, Dove prism, LCD space light modulator, half
Wave plate and reflecting mirror, wherein a quarter slide, polarization beam apparatus, Dove prism and front end non-polarizing beamsplitter keep coaxial position
Set relationship setting；LCD space light modulator is the LCD space light modulator of reflective phase-only modulation, laser emission element
The wavelength of the fundamental-mode gaussian beam of the linear polarization of output is in the modulated optical wavelength range of LCD space light modulator；Four points
One of the slide plane of incidence be also used as light-emitting surface, input terminal of the side of a quarter slide as composite light beam generation unit
With the shared end of output end, and the input terminal of front end non-polarizing beamsplitter and the shared end of output end are connected；A quarter slide
Another side be also used as the shared end of output end and receiving end, connect with the signal end of polarization beam apparatus；Dove prism is set
It sets and forms light processor all the way between polarization beam apparatus and LCD space light modulator, in polarization beam apparatus and liquid crystal spatial
Be additionally provided between optical modulator reflecting mirror and half wave plate group at another way light processor；A quarter slide will be for that will come from
The fundamental-mode gaussian beam for the linear polarization that laser emission element is imported by front end non-polarizing beamsplitter is converted into the base of round skewness
Mould Gaussian beam, is then input to polarization beam apparatus；The basic mode for the circle skewness that polarization beam apparatus exports a quarter slide is high
This light beam is divided into a branch of horizontal linear polarization light and a branch of perpendicular linear polarization light of isocandela, and wherein horizontal linear polarization light directly passes through
Dove prism is incident to LCD space light modulator direction；Reflecting mirror and half-wave plate will hang down for reflecting perpendicular linear polarization light
Rectilinearly polarized light is converted to horizontal linear polarization light, then also to the incidence of LCD space light modulator direction；Through polarization beam apparatus, instead
It penetrates the horizontal line polarisation of two beams that mirror and half-wave plate obtain while being incident on LCD space light modulator, generate two after phase modulated
Beam carries the light vortex beams of the same rotation direction of orbital angular momentum, wherein all the way light vortex beams through Dove prism back spin to reversed,
The oppositely oriented light vortex beams of two-way are transmitted using polarization beam apparatus to a quarter slide later, and a quarter slide will
The derotation of the mutually orthogonal linear polarization of obtained two-way is converted to left-right rotary circularly polarized light to light vortex beams, obtains complex light
Vortex beams, the input extreme direction using front end non-polarizing beamsplitter to crystal sensing unit are incident.
The crystal of crystal sensing unit uses bismuth-germanium-oxide crystal as a preferred technical solution,.
As a preferred technical solution, crystal sensing unit mainly by magnet system, rear end non-polarizing beamsplitter, crystal and
Reflecting mirror composition, wherein crystal, rear end non-polarizing beamsplitter and front end non-polarizing beamsplitter keep coaxial setting, wherein magnet system
System is for generating the magnetic field along optical axis of crystal direction；Rear end non-polarizing beamsplitter will apply reflected complex light before and after magnetic field
Vortex beams reflex to the input terminal of detection unit；Complex light vortex beams are incident along the optical axis direction of crystal, make to apply magnetic field
After generate Faraday magnetooptical effect；Reflecting mirror passes through crystal after reflecting complex light vortex beams again, makes Faraday magnetooptical effect
It doubles, then propagates complex light vortex beams to the input terminal of detection unit by rear end non-polarizing beamsplitter.As into one
Walk preferred technical solution, magnet system, which is used to apply, generates the varying strength along optical axis of crystal direction after different size electric current
Variable magnetic field.
Detection unit mainly includes linear polarizer and infrared camera as a preferred technical solution, wherein linear polarizer, red
The camera lens and rear end non-polarizing beamsplitter of outer camera keep coaxial setting；Linear polarizer is used to extract incident complex light vortex light
The linear polarization component of beam obtains light distribution in petal-like light vortex ring of light lattice；Infrared camera is petal-like for detecting
Change of the light vortex ring of light lattice before and after applying magnetic field, and the light spot image applied before and after magnetic field is captured, acquisition is passed in crystal
Feel the light distribution for applying the complex light vortex beams before magnetic field in unit and the light for applying the complex light vortex beams behind magnetic field
Strong distributed data.
The data processing module of detection unit and the upper function of detection unit external connection compare as a preferred technical solution,
Add the light distribution of the complex light vortex beams before and after magnetic field.
Pass through the data processing module of detection unit and the host computer of detection unit external connection as a preferred technical solution,
The hot spot picture in crystal sensing unit plus before and after magnetic field is subjected to correlation analysis using matlab simulation software, is added
The deflection angle of petal-like complex light vortex ring of light lattice behind magnetic field calculates the big of corresponding added electric current by the size of deflection
It is small, it finally carries out curve fitting with added size of current, obtains the pass of complex light vortex ring of light lattice deflection angle and added electric current
It is information, to realize the sensing detection to electric current.
The working principle of the invention:
The detection and sensing proposed by the present invention that electric current is realized using complex light vortex adds magnetic field front and back light by calculating
The deflection angle of spot measures the size of electric current.Pass through rotatory polarization analyzer or survey relative to traditional fibre optic current sensor
The method for measuring the different polarization states of light beam to acquire faraday's deflection angle of linearly polarized light, the present invention provides a kind of inspections in real time
Survey method quickly records the knots modification of interference hot spot by a high-resolution infrared camera, and the deflection angle of hot spot is with electricity
The increase of stream and increase, and have preferable linear relationship, improve measurement accuracy and accuracy.In addition, hot spot is in high-intensity magnetic field
Under deflection angle angle value it is smaller, be not above the theoretical deflection angle upper limit, therefore can detect to high-intensity magnetic field, high current
With sensing.
The present invention compared with prior art, has following obvious prominent substantive distinguishing features and remarkable advantage:
1. apparatus of the present invention can be carried out real-time detection, easy to operate；
2. apparatus of the present invention are easy for installation, occupy little space；
3. apparatus of the present invention improve measurement accuracy and accuracy.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of preferred embodiment of the present invention crystal current sensor.
Fig. 2 be preferred embodiment of the present invention crystal current sensor composite light beam generation unit ledger line polarizing film after obtain
Single order to the petal-like light vortex ring of light lattice schematic diagram of quadravalence.
Fig. 3 is the single order and the petal-like light vortex ring of light lattice of second order of preferred embodiment of the present invention crystal current sensor
Add the schematic diagram deflected before and after magnetic field.
Fig. 4 is that the petal-like light vortex ring of light lattice deflection angle of preferred embodiment of the present invention crystal current sensor is big
The small relation schematic diagram with added size of current.
Specific embodiment
Details are as follows for the preferred embodiment of the present invention:
In the present embodiment, referring to Fig. 1, a kind of crystal current sensor being vortexed based on complex light, including Laser emission
Unit A, front end non-polarizing beamsplitter 4, composite light beam generation unit B, crystal sensing unit C and detection unit D, Laser emission list
The input terminal of the output end connection front end non-polarizing beamsplitter 4 of first A, the input terminal and output end of composite light beam generation unit B is all
The signal end of front end non-polarizing beamsplitter 4 is connected, the output end connection crystal sensing unit C's of front end non-polarizing beamsplitter 4 is defeated
Enter end, the input terminal of the output end connecting detection cells D of crystal sensing unit C；Laser emission element A is for exporting linear polarization
Fundamental-mode gaussian beam, laser emission element A output linear polarization Gauss basic mode light beam wavelength composite light beam generate
In the modulated optical wavelength range of unit B；Front end non-polarizing beamsplitter 4 passes through the fundamental-mode gaussian beam of linear polarization directly,
To the fundamental-mode gaussian beam of composite light beam generation unit B input linear polarization；Composite light beam generation unit (B) will be for that will receive
The fundamental-mode gaussian beam of linear polarization be converted into light vortex beams, composite light beam generation unit (B) is first inclined by the line received
The fundamental-mode gaussian beam of polarization state is converted into the fundamental-mode gaussian beam of circular polarization state, then the fundamental-mode gaussian beam of circular polarization state is divided equally
At two-way linearly polarized light, two-way linearly polarized light is then modulated into light vortex beams, then closes beam and is converted to answering for circular polarization state
Then light combination vortex beams are exported to front end non-polarizing beamsplitter 4；Front end non-polarizing beamsplitter 4 can also will come from composite light beam
The complex light vortex beams that generation unit B is generated reflex to crystal sensing unit C；Crystal sensing unit C mainly includes crystal 13,
Crystal sensing unit C is used for will be from the complex light vortex beams that composite light beam generation unit B is generated along crystal (13) optical axis side
To being passed through in crystal 13, and apply along the magnetic field in optical axis of crystal direction, makes to generate Faraday magnetooptical effect after applying magnetic field, then
Complex light vortex beams before and after application magnetic field are reflexed into detection unit D；Detection unit D is single from crystal sensing for detecting
The light distribution for applying the complex light vortex beams before and after magnetic field of first C, and the deflection angle for adding magnetic field front and back hot spot is calculated, then
Using the data processing module of detection unit D and the host computer of detection unit D external connection, pass through the big subtotal of the deflection to hot spot
It calculates, the size of corresponding added electric current, to realize the sensing detection to electric current.Wherein, front end non-polarizing beamsplitter 4, complex light
Beam generation unit B, crystal sensing unit C, detection unit D emit the direction of laser along laser emission element A, sequentially
It is sequentially placed in the optical path.In the present embodiment current sensor device, after fundamental-mode gaussian beam is divided into two-beam, respectively through phase
Light vortex beams are converted into after the modulation of position.Complex light vortex beams are obtained after two-way combiner, detection complex light vortex beams exist
The deflection for adding the petal-like light vortex ring of light lattice in magnetic field front and back, the size for passing through deflection calculate the big of corresponding added electric current
It is small, to realize the function of current sense.
In the present embodiment, swash referring to the polarization-maintaining wideband adjustable that Fig. 1, laser emission element A mainly include coaxial setting
Light device 1, single mode polarization-maintaining wire jumper 2 and optical fiber collimator 3, and each optical device of laser emission element A all with unpolarized point of front end
The coaxial setting of beam device 4,3 output end of optical fiber collimator connect front end non-polarizing beamsplitter 4 as the output end of laser emission element A
Input terminal；Polarization-maintaining broadband tunable laser device 1 is used to generate the basic mode Gauss light of linear polarization；Single mode polarization-maintaining wire jumper 2 connects
Polarization-maintaining broadband tunable laser device 1 for exporting laser, and keeps the polarization state of light constant；Optical fiber collimator 3 is used for single mode
The fundamental-mode gaussian beam for the linear polarization that wire jumper 2 exports is collimated and is expanded, and launches 3 output end of optical fiber collimator sharp
Light forms the fundamental-mode gaussian beam of a branch of parallel linear polarization.
In the present embodiment, referring to Fig. 1, the light beam of the output end output of laser emission element A is in horizontality, compound
The fundamental-mode gaussian beam of the linear polarization received can be converted into the fundamental-mode gaussian beam of circular polarization state simultaneously by beam generating unit B
It is divided into two-way, is all the way a branch of horizontal linear polarization light, another way is a branch of perpendicular linear polarization light, and by two-way linearly polarized light tune
Light vortex beams are made, then closes beam and is converted to the complex light vortex beams of circular polarization state, then export to unpolarized point of front end
Beam device 4.
It in the present embodiment, mainly include a quarter slide 5, polarization beam splitting referring to Fig. 1, composite light beam generation unit B
Device 6, Dove prism 7, LCD space light modulator 8, half-wave plate 9 and reflecting mirror 10, wherein a quarter slide 5, polarization beam splitting
Device 6, Dove prism 7 and front end non-polarizing beamsplitter 4 keep the setting of position coaxial relationship；LCD space light modulator 8 is reflection
The LCD space light modulator of formula phase-only modulation, the wave of the fundamental-mode gaussian beam of the linear polarization of laser emission element A output
It grows in the modulated optical wavelength range of LCD space light modulator 8；5 plane of incidence of a quarter slide is also used as light-emitting surface, and four
One side of/mono- slide 5 connects front end as the input terminal of composite light beam generation unit B and the shared end of output end
The input terminal of non-polarizing beamsplitter 4 and the shared end of output end；Another side of a quarter slide 5 be also used as output end and
The shared end of receiving end, connect with the signal end of polarization beam apparatus 6；Dove prism 7 is arranged in polarization beam apparatus 6 and liquid crystal spatial
Light processor all the way is formed between optical modulator 8, is additionally provided between polarization beam apparatus 6 and LCD space light modulator 8 anti-
Penetrate the another way light processor that mirror 10 and half-wave plate 9 form；A quarter slide 5 from laser emission element A for that will pass through
The fundamental-mode gaussian beam for crossing the linear polarization of the importing of front end non-polarizing beamsplitter 4 is converted into the fundamental-mode gaussian beam of round skewness, so
It is input to polarization beam apparatus 6 backward；The fundamental-mode gaussian beam for the circle skewness that polarization beam apparatus 6 exports a quarter slide 5 point
At a branch of horizontal linear polarization light and a branch of perpendicular linear polarization light of isocandela, wherein horizontal linear polarization light directly passes through Dove prism
To the incidence of 8 direction of LCD space light modulator；Reflecting mirror 10 and half-wave plate 9 are for reflecting perpendicular linear polarization light, and by vertical line
Polarised light is converted to horizontal linear polarization light, then also to the incidence of 8 direction of LCD space light modulator；Through polarization beam apparatus 6, reflection
The horizontal line polarisation of two beams that mirror 10 and half-wave plate 9 obtain while it being incident on LCD space light modulator 8, is generated after phase modulated
Two beams carry the light vortex beams of the same rotation direction of orbital angular momentum, wherein light vortex beams are through 7 back spin of Dove prism to anti-all the way
To the oppositely oriented light vortex beams of two-way are transmitted using polarization beam apparatus 6 to a quarter slide 5 later, a quarter
The derotation of the mutually orthogonal linear polarization of obtained two-way is converted to left-right rotary circularly polarized light to light vortex beams by slide 5, is obtained
To complex light vortex beams, the input extreme direction using front end non-polarizing beamsplitter 4 to crystal sensing unit C is incident.
The front end non-polarizing beamsplitter 4 of the present embodiment passes through the fundamental-mode gaussian beam of linear polarization directly, and will be compound
The complex light vortex beams that beam generating unit B is generated reflex to crystal sensing unit C.
In the present embodiment, referring to Fig. 1, the crystal 13 of crystal sensing unit C uses bismuth-germanium-oxide crystal, bismuth-germanium-oxide crystal 13
For being passed through complex light vortex beams, make to generate Faraday magnetooptical effect after applying magnetic field.Crystal sensing unit C is mainly by magnet
System 11, rear end non-polarizing beamsplitter 12, crystal 13 and reflecting mirror 14 form, wherein crystal 13, rear end non-polarizing beamsplitter 12
Coaxial setting is kept with front end non-polarizing beamsplitter 4, wherein magnet system 11 is for generating along the magnetic field of 13 optical axis direction of crystal；
Rear end non-polarizing beamsplitter 12 reflexes to the input of detection unit D by the complex light vortex beams that magnetic field back reflection is returned are applied
End；Complex light vortex beams are incident along the optical axis direction of crystal 13, make to generate Faraday magnetooptical effect after applying magnetic field；Reflecting mirror
14, again by bismuth-germanium-oxide crystal 13, will double Faraday magnetooptical effect, then by complex light after the reflection of complex light vortex beams
Vortex beams are propagated by rear end non-polarizing beamsplitter 12 to the input terminal of detection unit D.Magnet system 11 is for applying difference
The variable magnetic field of the varying strength along 13 optical axis direction of crystal is generated after current.The present embodiment crystal sensing unit C is used for
The complex light vortex beams that the reflection of non-polarizing beamsplitter 4 comes are passed through in crystal along the optical axis of crystal, and are applied along optical axis of crystal side
To magnetic field, complex light vortex beams are exported to detection unit D later.Rear end non-polarizing beamsplitter 12 makes complex light vortex light
Beam directly passes through, and reflexes to detection unit D for the complex light vortex beams that magnetic field back reflection is returned are applied.
It in the present embodiment, mainly include linear polarizer 15 and infrared camera 16 referring to Fig. 1, detection unit D, middle line is inclined
Vibration piece 15, the camera lens of infrared camera 16 and rear end non-polarizing beamsplitter 12 keep coaxial setting；Linear polarizer 15 for extract into
The linear polarization component for the complex light vortex beams penetrated obtains light distribution in petal-like light vortex ring of light lattice；Infrared camera
16 for detecting change of the petal-like light vortex ring of light lattice before and after applying magnetic field, and captures the hot spot applied before and after magnetic field
Image, after acquiring the light distribution for applying the complex light vortex beams before magnetic field in crystal sensing unit C and applying magnetic field
The light distribution data of complex light vortex beams.
In the present embodiment, referring to Fig. 1, the data processing module of detection unit D and the upper function of detection unit D external connection
Compare the light distribution for adding the complex light vortex beams before and after magnetic field.The present embodiment passes through the data processing module of detection unit D
With the host computer of detection unit D external connection, using matlab simulation software by crystal sensing unit C plus magnetic field before and after hot spot
Picture carry out correlation analysis, obtain plus magnetic field after petal-like complex light vortex ring of light lattice deflection angle, pass through deflection
Size calculate the size of corresponding added electric current, finally carry out curve fitting with added size of current, obtain complex light vortex light
The relation information of ring lattice deflection angle and added electric current, to realize the sensing detection to electric current.The present embodiment detection unit D is used
The light distribution of complex light vortex beams before detection applies magnetic field and the light intensity for applying the complex light vortex beams behind magnetic field
Distribution, and compare the light distribution for adding the complex light vortex beams before and after magnetic field.
In the present embodiment, it referring to Fig. 1, when being tested, first has to guarantee that polarization-maintaining broadband tunable laser device 1 exports
Light beam be in horizontality, in addition to ensure laser emission element A, front end non-polarizing beamsplitter 4, composite light beam generation unit
All optical devices of B are all coaxial, finally to guarantee to enter complex light vortex beams along the optical axis of crystal of bismuth-germanium-oxide crystal 13
It penetrates, magnetic direction is also consistent with the optical axis of crystal of bismuth-germanium-oxide crystal 13.
In the present embodiment, it referring to Fig. 1, builds and the dry of complex light vortex beams is generated based on LCD space light modulator 8
System is related to, for generating each rank light swirl pattern, polarization-maintaining broadband tunable laser device 1 is regard as light source, is incident on and is loaded with entirely
On the LCD space light modulator 8 for ceasing figure, required light swirl pattern is obtained after diffraction.
In the present embodiment, referring to Fig. 1, the fundamental-mode gaussian beam of circle skewness is divided into isocandela by polarization beam apparatus 6
Two-way linearly polarized light, horizontal linear polarization light is directly incident on LCD space light modulator 8 and generates corresponding light vortex mould all the way
Formula, another way perpendicular linear polarization light are converted to horizontal linear polarization light after half-wave plate 9 and reflecting mirror 10, and are incident on from liquid crystal sky
Between optical modulator 8 generate same light swirl pattern, then through Dove prism 7 obtain derotation to light swirl pattern.The ranks such as two-way
Reversed light vortex beams close Shu Houzai through polarization beam apparatus 6 and obtain circular polarization state complex light vortex after a quarter slide 5
Light beam.
In the present embodiment, referring to Fig. 1, using petal-like light vortex ring of light lattice to magnetic field strength and size of current into
Row detection.Bismuth-germanium-oxide crystal 13 is put into magnet system 11, the optical axis of crystal and magnetic direction one of bismuth-germanium-oxide crystal 13 are kept
It causes.The complex light vortex beams of generation are passed through in magnetic field along the optical axis of crystal direction of bismuth-germanium-oxide crystal 13, in exit end plus one
A reflecting mirror 14, makes complex light vortex beams again by bismuth-germanium-oxide crystal 13, and after the reflection of rear end non-polarizing beamsplitter 12
Output, in output end plus a linear polarizer 15, extracts the line deviatoric component of light beam, is obtained with the detection of infrared camera 16 petal-like
Complex light vortex ring of light lattice is referring to fig. 2 the composite light beam generation unit ledger line polarization of the present embodiment crystal current sensor
The single order obtained after piece is to the petal-like light vortex ring of light lattice schematic diagram of quadravalence.
In the present embodiment, referring to Fig. 1, after turn-on current, magnet system 11 is made to generate different size of magnetic field, then with red
Outer camera 16 detects the form of petal-like complex light vortex ring of light lattice.Before and after record multiple groups add magnetic field, different size electric current
In the case of, the form of petal-like complex light vortex ring of light lattice is the one of the present embodiment crystal current sensor referring to Fig. 3
Rank and the petal-like light vortex ring of light lattice of second order add the schematic diagram deflected before and after magnetic field.
In the present embodiment, referring to Fig. 1, after galvanization, magnet system 11 generates magnetic field, petal-like complex light vortex light
Ring lattice has the deflection of certain angle before and after adding magnetic field, and deflection angle is related with size of current.It is shot with infrared camera 16
To under multiple groups different size electric current, add optical field distribution picture before and after magnetic field, before and after magnetic field will be added using matlab simulation software
Hot spot picture carry out correlation analysis, obtain plus magnetic field after petal-like complex light vortex ring of light lattice deflection angle, finally with
Added size of current carries out curve fitting, and the relationship of complex light vortex ring of light lattice deflection angle and added electric current is obtained, referring to figure
4, it is the petal-like light vortex ring of light lattice deflection angle size and added size of current of the present embodiment crystal current sensor
Relation schematic diagram, the present embodiment realizes that the crystal current being vortexed based on complex light is sensed.The present embodiment detection unit D is integrated with
Data processing module can be carried out image analysis calculation.Referring to Fig. 1, the laser emission element A of the present embodiment crystal current sensor
Export the fundamental-mode gaussian beam of linear polarization.The fundamental-mode gaussian beam of linear polarization is divided into two-way by composite light beam generation unit B,
And two-way linearly polarized light is modulated into light vortex beams, then close beam and be converted to the complex light vortex beams of circular polarization state.Crystal
Complex light vortex beams are passed through in crystal 13 by sensing unit C along the optical axis of crystal, and apply electric current generation along optical axis of crystal side
To variable magnetic field.Detection unit D detection applies the light distribution of the complex light vortex beams before and after magnetic field, complex light vortex light
Beam deflects after applying magnetic field.=
The present embodiment utilizes matlab by the data processing module of detection unit D and the host computer of detection unit D external connection
Hot spot picture in crystal sensing unit C plus before and after magnetic field is carried out correlation analysis by simulation software, obtains spending after adding magnetic field
The deflection angle of the complex light vortex ring of light lattice of petaloid calculates the size of corresponding added electric current by the size of deflection, finally
It carries out curve fitting with added size of current, obtains the relation information of complex light vortex ring of light lattice deflection angle and added electric current,
To realize the sensing detection to electric current.The present embodiment detection unit D is used to detect the complex light vortex beams before applying magnetic field
Light distribution and apply magnetic field after complex light vortex beams light distribution, then utilize detection unit D data processing
Module and the host computer of detection unit D external connection compare the light distribution for adding the complex light vortex beams before and after magnetic field.The present embodiment
Crystal current sensor can carry out the analytical calculation of image data and signal as just information acquisition terminal using host computer,
Without integrated complex computing module, function is simple, extensive using field.
The embodiment of the present invention is illustrated above in conjunction with attached drawing, but the present invention is not limited to the above embodiments, it can be with
The purpose of innovation and creation according to the present invention makes a variety of variations, under the Spirit Essence and principle of all technical solutions according to the present invention
Change, modification, substitution, combination or the simplification made, should be equivalent substitute mode, as long as meeting goal of the invention of the invention,
Without departing from the technical principle and inventive concept of the crystal current sensor being vortexed the present invention is based on complex light, this hair is belonged to
Bright protection scope.
Claims (10)
1. a kind of crystal current sensor being vortexed based on complex light, it is characterised in that: including laser emission element (A), front end
Non-polarizing beamsplitter (4), composite light beam generation unit (B), crystal sensing unit (C) and detection unit (D), the Laser emission
Unit (A) output end connection front end non-polarizing beamsplitter (4) input terminal, the input terminal of composite light beam generation unit (B) and
Output end all connects the signal end of front end non-polarizing beamsplitter (4), and the output end connection crystal of front end non-polarizing beamsplitter (4) passes
Feel the input terminal of unit (C), the input terminal of the output end connecting detection unit (D) of crystal sensing unit (C)；
Laser emission element (A) is used to export the fundamental-mode gaussian beam of linear polarization, the linear polarization of laser emission element (A) output
The wavelength of the fundamental-mode gaussian beam of state is in the modulated optical wavelength range of composite light beam generation unit (B)；
Front end non-polarizing beamsplitter (4) passes through the fundamental-mode gaussian beam of linear polarization directly, to composite light beam generation unit (B)
Input the fundamental-mode gaussian beam of linear polarization；
Composite light beam generation unit is used to the fundamental-mode gaussian beam of the linear polarization received being converted into light vortex beams, compound
The fundamental-mode gaussian beam of the linear polarization received is first converted into the basic mode Gauss light of circular polarization state by beam generating unit (B)
Beam, then the fundamental-mode gaussian beam of circular polarization state is divided into two-way linearly polarized light, two-way linearly polarized light is then modulated into light whirlpool
Optically-active beam, then close beam and be converted to the complex light vortex beams of circular polarization state, it then exports to front end non-polarizing beamsplitter (4)；
Front end non-polarizing beamsplitter (4) can also reflect the complex light vortex beams generated from composite light beam generation unit (B)
To crystal sensing unit (C)；
Crystal sensing unit (C) mainly includes crystal (13), and crystal sensing unit (C) will be for that will come from composite light beam generation unit
(B) the complex light vortex beams generated are passed through in crystal (13) along crystal (13) optical axis direction, and are applied along optical axis of crystal direction
Magnetic field, make apply magnetic field after generate Faraday magnetooptical effect, then by apply magnetic field before and after complex light vortex beams reflect
To detection unit (D)；
Detection unit (D) is used to detect the light for applying the complex light vortex beams before and after magnetic field from crystal sensing unit (C)
Strong distribution, and the deflection angle for adding magnetic field front and back hot spot is calculated, then utilize the data processing module and detection list of detection unit (D)
The host computer of first (D) external connection is calculated by the size of the deflection angle to hot spot, the size of corresponding added electric current, thus realization pair
The sensing detection of electric current.
2. the crystal current sensor being vortexed according to claim 1 based on complex light, it is characterised in that: laser emission element
(A) mainly include coaxial setting polarization-maintaining broadband tunable laser device (1), single mode polarization-maintaining wire jumper (2) and optical fiber collimator (3),
And the setting all coaxial with front end non-polarizing beamsplitter (4) of each optical device of laser emission element (A), the optical fiber collimator
(3) input terminal of the output end as output end connection front end non-polarizing beamsplitter (4) of the laser emission element (A)；Polarization-maintaining
Broadband tunable laser device (1) is used to generate the basic mode Gauss light of linear polarization, and keeps the polarization state of light constant；Single mode polarization-maintaining
Wire jumper (2) is for exporting laser；Optical fiber collimator (3) makes the optical fiber collimator (3) for being collimated and being expanded light beam
The laser that output end is launched forms the fundamental-mode gaussian beam of a branch of parallel linear polarization.
3. the crystal current sensor being vortexed according to claim 1 based on complex light, it is characterised in that: the Laser emission
The light beam of the output end output of unit (A) is in horizontality, the linear polarization that composite light beam generation unit (B) can will receive
Fundamental-mode gaussian beam be converted into the fundamental-mode gaussian beam of circular polarization state and be divided into two-way, be all the way a branch of horizontal linear polarization
Light, another way is a branch of perpendicular linear polarization light, and two-way linearly polarized light is modulated into light vortex beams, then close beam and be converted to circle
The complex light vortex beams of polarization state.
4. the crystal current sensor being vortexed according to claim 3 based on complex light, it is characterised in that: composite light beam generates
Unit (B) mainly include a quarter slide (5), polarization beam apparatus (6), Dove prism (7), LCD space light modulator (8),
Half-wave plate (9) and reflecting mirror (10), wherein a quarter slide (5), polarization beam apparatus (6), Dove prism (7) and front end are non-partially
Beam splitter (4) holding position coaxial relationship of shaking is arranged；LCD space light modulator (8) is that the liquid crystal of reflective phase-only modulation is empty
Between optical modulator, laser emission element (A) output linear polarization fundamental-mode gaussian beam wavelength in liquid crystal spatial light modulation
In the modulated optical wavelength range of device (8)；A quarter slide (5) plane of incidence is also used as light-emitting surface, a quarter slide (5)
One side connects the unpolarized beam splitting in front end as the input terminal of composite light beam generation unit (B) and the shared end of output end
The input terminal of device (4) and the shared end of output end；Another side of a quarter slide (5) is also used as output end and receiving end
Shared end, connect with the signal end of polarization beam apparatus (6)；Dove prism (7) is arranged in polarization beam apparatus (6) and liquid crystal spatial
Optical modulator forms light processor all the way between (8), between polarization beam apparatus (6) and LCD space light modulator (8) also
The another way light processor formed equipped with reflecting mirror (10) and half-wave plate (9)；A quarter slide (5) will be for that will come from laser
The fundamental-mode gaussian beam for the linear polarization that transmitting unit (A) is imported by front end non-polarizing beamsplitter (4) is converted into round skewness
Fundamental-mode gaussian beam is then input to polarization beam apparatus (6)；The circle that polarization beam apparatus (6) exports a quarter slide (5) is inclined
The fundamental-mode gaussian beam of state is divided into a branch of horizontal linear polarization light and a branch of perpendicular linear polarization light of isocandela, wherein horizontal linear polarization
Light directly passes through Dove prism (7) to the incidence of LCD space light modulator (8) direction；Reflecting mirror (10) and half-wave plate (9) are used for
Perpendicular linear polarization light is reflected, and perpendicular linear polarization light is converted into horizontal linear polarization light, then also to LCD space light modulator
(8) direction is incident；The horizontal line polarisation of two beams obtained through polarization beam apparatus (6), reflecting mirror (10) and half-wave plate (9) is incident simultaneously
To LCD space light modulator (8), the light vortex beams that two beams carry the same rotation direction of orbital angular momentum are generated after phase modulated,
Wherein all the way light vortex beams through Dove prism (7) back spin to reversed, later the oppositely oriented light vortex beams of two-way using
Polarization beam apparatus (6) is transmitted to a quarter slide (5), and a quarter slide (5) is inclined by the mutually orthogonal line of obtained two-way
The derotation of polarization state is converted to left-right rotary circularly polarized light to light vortex beams, obtains complex light vortex beams, non-partially using front end
The input extreme direction of vibration beam splitter (4) Xiang Jingti sensing unit (C) is incident.
5. the crystal current sensor being vortexed according to claim 1 based on complex light, it is characterised in that: the crystal sensing
The crystal (13) of unit (C) uses bismuth-germanium-oxide crystal.
6. the crystal current sensor being vortexed according to claim 1 based on complex light, it is characterised in that: the crystal sensing
Unit (C) is mainly made of magnet system (11), rear end non-polarizing beamsplitter (12), crystal (13) and reflecting mirror (14), wherein
Crystal (13), rear end non-polarizing beamsplitter (12) and front end non-polarizing beamsplitter (4) keep coaxial setting, wherein magnet system
(11) for generating along the magnetic field of crystal (13) optical axis direction；Rear end non-polarizing beamsplitter (12) is reflected back before and after applying magnetic field
The complex light vortex beams come reflex to the input terminal of detection unit (D)；Optical axis side of the complex light vortex beams along crystal (13)
To incidence, make to generate Faraday magnetooptical effect after applying magnetic field；Reflecting mirror (14) passes through again after reflecting complex light vortex beams
Crystal (13), doubles Faraday magnetooptical effect, then by complex light vortex beams by rear end non-polarizing beamsplitter (12) to
The input terminal of detection unit (D) is propagated.
7. the crystal current sensor being vortexed according to claim 6 based on complex light, it is characterised in that: magnet system (11)
For applying the variable magnetic field for generating the varying strength of crystal (13) optical axis direction after different size electric current.
8. the crystal current sensor being vortexed according to claim 1 based on complex light, it is characterised in that: detection unit (D)
It mainly include linear polarizer (15) and infrared camera (16), wherein linear polarizer (15), the camera lens of infrared camera (16) and rear end
Non-polarizing beamsplitter (12) keeps coaxial setting；Linear polarizer (15) is used to extract the linear polarization of incident complex light vortex beams
Component obtains light distribution in petal-like light vortex ring of light lattice；Infrared camera (16) is vortexed for detecting petal-like light
Change of the ring of light lattice before and after applying magnetic field, and the light spot image applied before and after magnetic field is captured, acquisition is sensed in the crystal
Apply the light distribution of the complex light vortex beams before magnetic field in unit (C) and applies the light of the complex light vortex beams behind magnetic field
Strong distributed data.
9. the crystal current sensor being vortexed according to claim 1 based on complex light, it is characterised in that: the detection unit
(D) the upper function of data processing module and detection unit (D) external connection, which compares, adds the complex light vortex beams before and after magnetic field
Light distribution.
10. the crystal current sensor being vortexed according to claim 1 based on complex light, it is characterised in that: pass through the inspection
The data processing module of unit (D) and the host computer of detection unit (D) external connection are surveyed, it will be in the crystalline substance using matlab simulation software
Hot spot picture before and after in body sensing unit (C) plus magnetic field carries out correlation analysis, and detection complex light vortex beams are adding magnetic field
The deflection of the petal-like light vortex ring of light lattice in front and back calculates the size of corresponding added electric current by the size of deflection, most
It carries out curve fitting afterwards with added size of current, the relationship for obtaining complex light vortex ring of light lattice deflection angle and added electric current is believed
Breath, to realize the sensing detection to electric current.
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